It is one of the chief skills of the philosopher not to occupy himself with questions which do not concern him.
Philosophy is like trying to open a safe with a combination lock: each little adjustment of the dials seems to achieve nothing, only when everything is in place does the door open.
With my full philosophical rucksack I can only climb slowly up the mountain of mathematics.
A confession has to be part of your new life.
I am showing my pupils details of an immense landscape which they cannot possibly know their way around.
Sometimes, in doing philosophy, one just wants to utter an inarticulate sound.
Human beings have a physical need to tell themselves when at work: "Let's have done with it now," and it's having constantly to go on thinking in the face of this need when philosophizing that makes this work so strenuous.
You can't be reluctant to give up your lie and still tell the truth.
We could present spatially an atomic fact which contradicted the laws of physics, but not one which contradicted the laws of geometry.
Black seems to make a colour cloudy, but darkness doesn't. A ruby could thus keep getting darker without ever becoming cloudy; but if it became blackish red, it would become cloudy.
Golden is a surface colour.
One age misunderstands another; and a petty age misunderstands all the others in its own ugly way.
One can defend common sense against the attacks of philosophers only by solving their puzzles, i.e., by curing them of the temptation to attack common sense.
Only let's cut out the transcendental twaddle when the whole thing is as plain as a sock on the jaw.
Logic must look after itself. In a certain sense, we cannot make mistakes in logic.
All propositions are of equal value.
The form is the possibility of the structure.
If we were to imagine an orange on the blue side or green on the red side or violet on the yellow side, it would give us the same impression as a north wind coming from the southwest.
In the world everything is as it is and happens as it does happen. In it, there is no value, - and if there were, it would be of no value.
This procedure [selecting the simplest law], however, has no logical justification but only a psychological one.
It is possible--indeed possible even according to the old conception of logic--to give in advance a description of all 'true' logical propositions. Hence there can never be surprises in logic.
Everything that can be thought at all can be thought clearly. Everything that can be said can be said clearly. Ludwig Wittgenstein
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